working! thanks!
btw: one problem is the strange menue translation from english to german:
'Column settings' > 'Detaileinstellungen'
that should be changed to 'Spalteneinstellungen' so that the user can recognize that these settings refer to columns.
thanks..

I had Already said something about this lack in one of my previous post.
They just could put a Symbol like that Δ or a simply E at the end of the name header of the show items listed, where this symbol just recall a routine to sort items by extension, without use a new column.
For now it's possible just to put that order as personalize Bar_Instrument_Action above the headers of show entities windows "right and left panels".
There you can add extension_order called A..Z for right and left panels.
Sadly there isn't just a single A..Z extension order for active panel.
That means you have to show two time those two instument for the same function, neither is possible to configure in different way half left and half right side of this bar.
Alternatevely you can take in your mind, that you can reach that sort by extension order with CTRL_SHFT_F4.